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Solved: We analyzed the biceps muscle example with the
Chapter 9, Problem 31(choose chapter or problem)
Problem 31PE
We analyzed the biceps muscle example with the angle between forearm and upper arm set at 90º. Using the same numbers as in Example 9.4, find the force exerted by the biceps muscle when the angle is 120º and the forearm is in a downward position.
Example 9.4:
Muscles Exert Bigger Forces Than You Might Think
Calculate the force the biceps muscle must exert to hold the forearm and its load as shown in Figure 9.27, and compare this force with the weight of the forearm plus its load. You may take the data in the figure to be accurate to three significant figures.
Questions & Answers
QUESTION:
Problem 31PE
We analyzed the biceps muscle example with the angle between forearm and upper arm set at 90º. Using the same numbers as in Example 9.4, find the force exerted by the biceps muscle when the angle is 120º and the forearm is in a downward position.
Example 9.4:
Muscles Exert Bigger Forces Than You Might Think
Calculate the force the biceps muscle must exert to hold the forearm and its load as shown in Figure 9.27, and compare this force with the weight of the forearm plus its load. You may take the data in the figure to be accurate to three significant figures.
ANSWER:
Solution
Step 1 of 4
In this case there are four forces acting on the forearm that are, FB is the magnetic force of the biceps, FE is the triceps, wa is the forearm weight and wb the load weight.We need to find out the force exerted by the biceps muscle when the angle is 1200 and the forearm is in the downward direction.